furnace fan

[russ1102]

Put my fifth wheel away for the winter and the furnace fan won't shut off. No propane on, just battery. Any ideas what the cause might be?

[2oldman]

DrewE wrote:
disconnect the thermostat.

x2

[DrewE]

Could also be a wiring short on the thermostat wires, or a broken thermostat. Probably the easiest way to rule those out (or not) is to disconnect the thermostat connections at the furnace's control board; it should not operate with them disconnected.

[enblethen]

Make and model of furnace would help.
Could be stuck time delay relay or circuit board depending on make and model.

[russ1102]

Makes no difference where the thermostat is set or function.

[troubledwaters]

Thermostat set to the fan on function?